OS Pen (On-Screen Pen) vs Zoom annotation: desktop overlay or meeting tool?
Zoom annotation is connected to a meeting and shared content. OS Pen is a Windows overlay designed to remain available across the desktop workflow.
Annotation that stays with you after the meeting ends
Zoom's annotation lives inside a Zoom share. OS Pen sits on the Windows desktop itself, so the same pen, spotlight, and screenshot tools are there before, during, and after a call, and in apps that never touch a meeting.
See everything the desktop overlay can do in the Windows screen annotation overview.
The central difference
Zoom's official documentation describes annotation controls for shared screens and whiteboards, with host settings that determine who can annotate. That makes it useful when meeting participants need controlled collaboration inside Zoom.
OS Pen runs as a separate Windows annotation workspace. It is designed for a presenter who moves among desktop apps, documents, browsers, and slides while keeping annotation and presentation tools available.
At-a-glance comparison
| Topic | OS Pen / first check | Other product / next check |
|---|---|---|
| Primary context | OS Pen: the Windows desktop and applications | Zoom: a Zoom meeting's shared screen or whiteboard |
| Participant control | Local annotation; local Wi-Fi collaboration is available as a Premium Beta feature | Host can control whether participants annotate, according to Zoom settings |
| Precision tools | Ruler, protractor, compass, coordinates, shapes and text | Zoom provides meeting annotation tools; check the current Zoom toolbar documentation |
| Presentation tools | Spotlight, curtain, timer, laser-style pointer and whiteboard | Spotlight and annotation controls are integrated with screen sharing |
| Saving output | Screenshots, GIFs, PDF export, redaction, and local recording features by plan | Zoom documents saving whiteboards and annotations in supported formats |
| Use outside meetings | Available across supported Windows workflows | Meeting annotation is tied to Zoom's meeting and sharing context |
Use both carefully in a live meeting
If OS Pen is used while sharing through Zoom, run a private test first. Confirm that the selected Zoom share mode captures the OS Pen overlay, the pointer is visible, and sensitive desktop areas are excluded. Capture behavior can vary when sharing a window instead of the full display.
Use Zoom's native annotation when participants must mark the shared content under host control. Use a desktop overlay when the presenter needs the same annotation workflow across applications or outside a meeting.
Official sources checked
Zoom screen sharing · Zoom annotation tools
Zoom and OS Pen both change over time. Check Zoom's current documentation and the OS Pen pricing page before deciding.
Frequently asked questions
Does OS Pen replace Zoom?
No. Zoom provides meetings and screen sharing. OS Pen provides a Windows annotation workspace and related tools.
Can viewers annotate with OS Pen during Zoom?
Zoom participant annotation is controlled through Zoom. OS Pen has a separate local Wi-Fi collaboration feature marked Premium Beta; test it independently before a live session.
Why might an overlay not appear in Zoom capture?
The result can depend on whether Zoom shares a window or the full display and how the application renders overlays. Run a short private test before presenting.
Add a desktop pen to your next Zoom call
Download OS Pen, run the private Zoom test described above, and start with Pen, Eraser, and Screenshot, free with no account required.